Arthroscopic Versus Open Brostrom for Ankle Instability

Inclusion Criteria: * Individuals must be older than 18 and younger than 65 years of age, both genders; * Participants must be experiencing instability symptoms at the ankle over the last six months; * Clinical diagnosis of ankle instability, defined as the presence of at least one previous ankle sprain associated with a current instability sensation by the patient and the presence of a positive anterior drawer test; the previous lateral ligament injury must be confirmed by Magnetic Resonance Imaging (MRI) findings. Exclusion Criteria: * Previous surgery involving the affected foot or ankle; * History or documented evidence of autoimmune or peripheral vascular diseases; * History or documented evidence of peripheral neuropathy (nervous compression syndrome, tarsal tunnel syndrome) or systemic inflammatory disease a (rheumatoid arthritis, spondylitis, Reiter Syndrome, etc.); * Associated injuries, such as osteochondral lesions, tendon ruptures and fractures. * Associated instability, such as syndesmotic and medial instability. * Cavovarus foot; * BMI over 35; * Previous infiltration in the ankle over the six months preceding the initial assessment; * Pregnancy; * Any condition that represents a contraindication of the proposed therapies; * Impossibility or incapacity to sign the informed Consent Form; * History or documented evidence of blood coagulation disorders (including treatment with anti-coagulants, but excluding aspirin); * Use of heart pacemaker; * Presence of infectious process (superficial on skin and cellular tissue, or deep in the bone) in the region to be treated;